本文選題：入水砰擊 + 圓柱體　； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：艦船在惡劣海況下高速航行,當船首出水再次入水時候,首部結(jié)構(gòu)容易遭受劇烈的水動力砰擊載荷作用。根據(jù)發(fā)生砰擊的船首部位不同,可以分為船底砰擊和外飄砰擊。嚴重的砰擊會對局部結(jié)構(gòu)安全性造成威脅,同時砰擊還會引起船體梁的振動,威脅整體結(jié)構(gòu)安全性。研究艦船砰擊問題具有非常重要的理論意義和工程價值。本論文主要針對局部砰擊問題進行研究。由于船舶首部三維形狀的復(fù)雜性,合理預(yù)報其砰擊載荷難度較大。論文對船舶首部砰擊問題做了簡化,針對典型的圓柱體結(jié)構(gòu)開展入水分析,采用試驗和剛性體數(shù)值模擬方法研究其載荷變化。論文研究采用粘性流體力學(xué)軟件Fluent開展剛體入水砰擊載荷數(shù)值工作,針對30度楔形體和圓柱體入水砰擊兩個問題,開展了數(shù)值模擬工作,預(yù)報結(jié)果與公開文獻發(fā)表的實驗數(shù)據(jù)進行了對比,吻合較好,驗證了數(shù)值模擬方法的合理性和準確性。論文針對圓柱體入水砰擊問題,開展了模型試驗研究,焊接制作了鋁制圓柱體結(jié)構(gòu),設(shè)計實施了一套入水砰擊模型試驗機構(gòu),測試了入水砰擊的加速度、結(jié)構(gòu)應(yīng)力和壓力響應(yīng)。然后,采用基于Fluent軟件的CFD數(shù)值方法,開展了入水砰擊載荷數(shù)值分析工作,預(yù)報的剛體入水加速度和砰擊壓力載荷與模型試驗結(jié)果吻合較好。本論文提出的CFD數(shù)值模擬方法,具有較好的應(yīng)用前景,可以應(yīng)用到更加復(fù)雜的二維和三維剛體結(jié)構(gòu)入水砰擊載荷問題,可以為今后研究具體船首局部結(jié)構(gòu)砰擊載荷問題提供技術(shù)支持。
[Abstract]:When the ship is sailing at high speed under the bad sea conditions, the head structure is vulnerable to severe hydrodynamic slamming load when the bow outlet is re-entered into the water. According to the bow of the ship slamming, it can be divided into bottom slamming and floating slamming. Severe slamming will threaten the safety of local structures, and will also cause vibration of the hull girder, threatening the safety of the whole structure. It is of great theoretical significance and engineering value to study the ship slamming problem. This paper focuses on the local slamming problem. Due to the complexity of the 3D shape of the ship's head, it is difficult to predict the slamming load reasonably. In this paper, the first slamming problem of a ship is simplified, and the load variation of typical cylindrical structure is studied by means of test and rigid body numerical simulation. In this paper, the viscous fluid dynamics software Fluent is used to carry out the numerical work of rigid body slamming load, and the numerical simulation work is carried out to solve the problem of 30 degree wedge and cylinder entering water slamming. The prediction results are in good agreement with the experimental data published in the public literature, and the rationality and accuracy of the numerical simulation method are verified. Aiming at the problem of water slamming in cylinder, the model test is carried out, the aluminum cylinder structure is made by welding, a set of water slamming model test mechanism is designed and implemented, and the acceleration, structural stress and pressure response of water slamming are tested. Then, the numerical analysis of water slamming load is carried out by using CFD numerical method based on Fluent software. The predicted acceleration and slamming pressure of rigid body are in good agreement with the model test results. The CFD numerical simulation method proposed in this paper has a good application prospect and can be applied to the more complex two-dimensional and three-dimensional rigid body structure water slamming load problem. It can provide technical support for future research on slamming load problem of specific bow local structure.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U661.4

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